Plant cells do not divided their cytoplasm by forming a furrow in cell membrane like animal cells rather they divide by cell plate because
1. | Plant cell do not have centrioles |
2. | Cell wall formation beings with formation of cell plate |
3. | Cell plate represents middle lamella between the walls of two adjacent cells |
4. | Plant cells are enclosed by a relatively inextensible wall |
Metaphase I is different from mitotic metaphase as in the later case
1. | Two metaphasic plates are formed |
2. | Tetrads are arranged at the equator |
3. | Single metaphasic plate is formed |
4. | Homologous chromosomes get separated from each other |
Given below are two statements : One is labeled as Assertion (A) and the other is labeled as Reason (R)
Assertion (A): | The growth of the multicellular organism is due to mitosis |
Reason (R): | Mitosis is also called as equational division and it offers genetic stability |
In light of the above statements choose the correct answer from the options given below:
1. | (A) is True but (R) is False. |
2. | (A) is False but (R) is True. |
3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Select the correct sequence of events occurring during prophase-I of meiosis-I
(a) | Nuclear envelope breakdown |
(b) | Synaptonemal complex formation |
(c) | Compaction of chromosomes |
(d) | Terminalisation of chiasmata |
(e) | Crossing over |
Choose the most appropriate answer from the options given below:
1. | (c) → (b) → (e) → (d) → (a) |
2. | (c) → (a) → (b) → (d) → (e) |
3. | (b) → (c) → (a) → (d) → (e) |
4. | (c) → (a) → (b) → (e) → (d) |
1. | 16 and 16 | 2. | 16 and 32 |
3. | 8 and 16 | 4. | 16 and 8 |
Assertion (A): | Meiosis does not occur in haploids cells. |
Reason (R): | Haploid cells do not form gametes. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | During anaphase-1 of meiosis, non-homologous chromosomes separate. |
Reason (R): | There is splitting of centromere during anaphase-1. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Cell division is a very important process in all living organisms. |
Reason (R): | During the division of a cell, DNA replication and cell growth also take place. |
1. | (A) is True; (R) is False |
2. | Both (A) and (R) are True and (R) correctly explains (A) |
3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
4. | (A) is False; (R) is True |
Assertion (A): | Metaphase is the stage at which morphology of chromosomes is most easily studied. |
Reason (R): | At this stage, metaphase chromosome is made up of two sister chromatids, which are held together by the centromere. |
1. | (A) is True; (R) is False |
2. | Both (A) and (R) are True and (R) correctly explains (A) |
3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
4. | (A) is False; (R) is True |